I downloaded the trial version of this game and then the full game. I was really enjoying it and had no problems with it. Then I upgraded my OS. I then went back to play the game. It seemed to be downloading just fine until I pushed the button to start playing. The screen went to black and my list of games came up. I determined that the problem is not with my computer but a glitch in the game. I hope the creators of the game will try to fix it.